Bra Size Calculator

Use it when your task matches one of these common needs: Get a quick starting size before checking brand charts. Understand the difference between band size and cup difference. It works best when you already know the measurements, amounts, units, or options the page asks for.

In plain language: The calculator rounds underbust up to an even band size, subtracts band size from bust size, and maps the difference to an approximate cup label. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.

The main inputs are the measurements, amounts, units, or options the tool needs before it can work. Read each field label, keep units consistent, and compare your entry with the examples if the answer looks strange.

Read the headline answer, then check the smaller lines beside it. For everyday tools, those lines usually show the distance, time, cost, units, or setting that made the answer change.

Bra sizing varies by brand, body shape, country, and style. Use this as a fitting starting point, not a guaranteed size. Also check the unit, scale, mode, and result limit because small input changes can change the answer.

No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.